Heavy water reactor nuclear power station pressure detection module

Abstract

The invention belongs to the technical field of instrument control, and relates to a heavy water reactor nuclear power station pressure detection module which comprises a sensor base, a sensor induction structure, a loading and unloading machine leakage detection transmitter fixing structure and a dowel bar. The loading and unloading machine leakage detection transmitter fixing structure comprises a movable block support and a movable block. The elastic sheet is installed on the sensor base, two resistance strain gauges are pasted on the side face of the elastic sheet, and enameled wires are led out of the strain gauges. The movable block is placed in a groove of the movable block support, the movable block and the movable block support are respectively provided with a through hole, a rotating column of the loading and unloading machine leakage detection transmitter penetrates through the sensor base and the through holes, and the movable block and the movable block support are locked on the rotating column through support fixing bolts. The two ends of the dowel bar are fixedly connected with the elastic piece and the movable block support respectively. The equipment performance of the loading and unloading machine leakage detection transmitter can be effectively optimized, the precision is high, the linearity is good, and the reliability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of instrument control, and in particular relates to a pressure detection module for a heavy water reactor nuclear power plant. Background Art

[0002] Heavy water reactor nuclear power plants have the characteristics of non-stop refueling. To ensure refueling, the power plant is designed with a complete refueling system to serve it. The core equipment is the refueling machine, among which the leakage detection transmitter of the refueling machine is used to detect the leakage of heavy water in the nozzle cavity when the nozzle of the refueling machine is clamped on the reactor channel and pressure is established. It is essentially a differential pressure transmitter, which causes the internal sensor module to deform through differential pressure, and generates a 4-20mA signal output that is linearly related to the pressure through transmission processing.

[0003] After long-term operation, the reliability of the existing leakage detection transmitter for loading and unloading machines has gradually decreased. The output value drifts frequently and the transmitter cannot be used, so it can only be replaced with spare parts.

[0004] Therefore, it is urgent to develop a module for detecting the equipment performance of the leakage detection transmitter of the loading and unloading machine, so as to optimize the equipment performance of the leakage detection transmitter of the loading and unloading machine and effectively improve the reliability of the on-site equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a heavy water reactor nuclear power plant pressure detection module, which can be installed in the heavy water reactor loader and unloader leakage detection transmitter, can effectively optimize the equipment performance of the loader and unloader leakage detection transmitter, and has multiple characteristics such as high precision, good linearity, high reliability, etc. After actual verification on site, it can run perfectly and effectively improve the reliability of on-site equipment.

[0006] The technical solution to achieve the purpose of the present invention is:

[0007] A pressure detection module for a heavy water reactor nuclear power plant, the detection module comprising: a sensor base, a sensor sensing structure, a fixed structure of a leakage detection transmitter for a loader and unloader, and a force transmission rod, the sensor sensing structure comprising an elastic sheet, a strain gauge, and an enameled wire, the fixed structure of the leakage detection transmitter for a loader and unloader comprising a movable block bracket and a movable block; the elastic sheet is mounted on the sensor base, two resistance strain gauges are pasted to the side of the elastic sheet, and enameled wires are led out of the strain gauges; the movable block is placed in a groove of the movable block bracket, a through hole is provided on the movable block and the movable block bracket, a rotating column of the leakage detection transmitter for the loader and unloader passes through the sensor base and the through hole, and the movable block and the movable block bracket are locked on the rotating column by bracket fixing bolts; the two ends of the force transmission rod are respectively fixedly connected to the elastic sheet and the movable block bracket.

[0008] The detection module also includes a pressing block, an elastic sheet is located between the pressing block and the sensor base, and the pressing block is connected to the elastic sheet.

[0009] The pressing block is connected to the elastic sheet via screws.

[0010] The pressing block and the elastic sheet are installed on the sensor base through positioning pins.

[0011] A transition pad is pasted on the plane of the sensor base, and the transition pad is used for transferring the enameled wire.

[0012] The force transmission rod is a bronze wire with a diameter of 0.2-0.3 mm.

[0013] The force transmission rod is connected to the elastic sheet and the movable block bracket by welding.

[0014] The sensor base is provided with a slotted hole for positioning and fixing with the mounting point on the pressure test body, and the sensor base and the pressure test body are locked by fixing bolts.

[0015] The beneficial technical effects of the present invention are:

[0016] 1. A heavy water reactor nuclear power plant pressure detection module provided by the present invention is suitable for a leakage detection transmitter of a loader and unloader of a heavy water reactor nuclear power plant, which can effectively improve the performance of the leakage detection transmitter of the loader and unloader of a heavy water reactor nuclear power plant, enhance the reliability of the equipment, and reduce the failure rate of the transmitter during online operation.

[0017] 2. The heavy water reactor nuclear power plant pressure detection module provided by the present invention has high detection accuracy and good linearity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a pressure detection module for a heavy water reactor nuclear power plant provided by the present invention;

[0019] Figure 2 A front view of a pressure detection module for a heavy water reactor nuclear power plant provided by the present invention;

[0020] Figure 3 A top view of a pressure detection module for a heavy water reactor nuclear power plant provided by the present invention;

[0021] Figure 4 This is a left view of a pressure detection module for a heavy water reactor nuclear power plant provided by the present invention.

[0022] In the figure: 1-fixing bolt; 2-sensor base; 3-movable block bracket; 4-force transmission rod; 5-elastic sheet; 6-strain gauge; 7-enameled wire; 8-pressure block; 9-screw; 10-transition pad; 11-movable block; 12-bracket fixing bolt; 13-fixing hole; 14-locating pin. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] A heavy water reactor nuclear power plant pressure detection module provided by the present invention mainly uses the principle of mechanical deformation to make the resistance strain gauge generate and transmit an electrical signal based on the monitored rotation angle, so as to achieve the purpose of detecting the pressure value.

[0025] like Figure 1-4 As shown, a pressure detection module for a heavy water reactor nuclear power plant provided by the present invention comprises: a sensor base 2, a sensor sensing structure, a fixed structure of a loader and unloader leakage detection transmitter, and a force transmission rod 4. The sensor sensing structure comprises an elastic sheet 5, a strain gauge 6, and an enameled wire 7. The fixed structure of the loader and unloader leakage detection transmitter comprises a movable block bracket 3 and a movable block 11.

[0026] The sensor base 2 is provided with a slotted hole for positioning and fixing with the mounting point on the pressure test body and is locked by the fixing bolt 1 .

[0027] The elastic sheet 5 is a metal elastic sheet. The side of the elastic sheet 5 is provided with a set deformation zone process to paste two resistance strain gauges 6, and the strain gauge 6 is led out of the enameled wire 7; the elastic sheet 5 is designed into an irregular shape according to the pressure requirements to be measured. Since the elastic sheet 5 is the core component of the sensor measurement, its installation position must have precise size control, so the elastic sheet 5 is provided with a positioning hole, and a positioning pin 14 is inserted inside. The elastic sheet 5 forms an assembly after the strain gauge 6 is pasted by the process. A pressure block 8 is provided on one side of the elastic sheet 5. The elastic sheet 5 is located between the pressure block 8 and the sensor base 2. Two screw holes are provided on the elastic sheet 5. Two screws 9 fix the pressure block 8 on the elastic sheet 5 through the screw holes, and are installed on the sensor base 2 in cooperation with the precise positioning pin 14. A fixing hole 13 is provided at the weak point of the tail of the elastic sheet 5, and a force transmission rod 4 is passed through the fixing hole 13, and the connection is fixed by soldering.

[0028] The movable block 11 is placed in the groove of the movable block bracket 3. A through hole is provided on the movable block 11 and the movable block bracket 3 for passing the rotating column of the leakage detection transmitter of the loader and unloader. The bracket fixing bolt 12 locks the movable block 11 and the movable block bracket 3 on the rotating column.

[0029] A transition pad 10 is pasted on the plane where the sensor base 2 is installed, and its function is to transfer the enameled wire 7 through a transition to avoid affecting the sensor sensing structure.

[0030] The force transmission rod 4 is a bronze wire with a diameter of 0.2 to 0.3 mm. Since the measured pressure is relatively low and it is a process of converting the rotation angle into deformation, the material of the bronze wire is very suitable for the requirements. One end of the force transmission rod 4 passes through the fixing hole 13 designed on the elastic sheet 5 and is fixed by process welding. The other end is mounted in a specially designed groove on the movable block bracket 3 and is fixed by process welding.

[0031] A heavy water reactor nuclear power plant pressure detection module provided by the present invention is used to detect the leakage detection transmitter of the loading and unloading machine, as follows:

[0032] Place the movable block 11 in the groove of the movable block bracket 3, form an assembly through the bracket fixing bolts 12, and then use the installation height of the elastic sheet 5 as a reference, adjust the matching height with the positioning tooling, and lock it on the rotating column of the leakage detection transmitter of the loader and unloader through the bracket fixing bolts 12 so that it can transmit rotation.

[0033] After the pressure module is installed on the heavy water reactor loader and unloader leakage detection transmitter, when the transmitter detects pressure, its rotating column will undergo angular displacement and transmit the rotation amount to the movable block 11. The movable block 11 continues to transmit the rotation amount to the elastic sheet 5 through the force transmission rod 4, and the elastic sheet deforms to drive the strain gauge 6 to generate a deformation amount. The pressure module designs the core parameters such as the relevant deformation amount and material thickness of the sensor elastic sheet through its maximum rotation angle, and finally converts the rotation angle into a deformation amount, and converts it into a weak voltage signal to output to the transmitter module, and then the transmitter module outputs it to the acquisition unit.

[0034] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A pressure detection module for a heavy water reactor nuclear power plant, characterized in that: The detection module comprises: a sensor base (2), a sensor sensing structure, a fixed structure of a leakage detection transmitter for a loading and unloading machine, and a force transmission rod (4); the sensor sensing structure comprises an elastic sheet (5), a strain gauge (6), and an enameled wire (7); the fixed structure of the leakage detection transmitter for a loading and unloading machine comprises a movable block bracket (3) and a movable block (11); the elastic sheet (5) is mounted on the sensor base (2); two resistance strain gauges (6) are pasted on the side of the elastic sheet (5); the enameled wire (7) is led out from the strain gauge (6); the movable block (11) is placed in a groove of the movable block bracket (3); a through hole is provided on the movable block (11) and the movable block bracket (3); a rotating column of the leakage detection transmitter for the loading and unloading machine passes through the sensor base (2) and the through hole; the movable block (11) and the movable block bracket (3) are locked on the rotating column by a bracket fixing bolt (12); and the two ends of the force transmission rod (4) are respectively fixedly connected to the elastic sheet (5) and the movable block bracket (3).

2. A heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: The detection module further comprises a pressing block (8), an elastic sheet (5) is located between the pressing block (8) and the sensor base (2), and the pressing block (8) is connected to the elastic sheet (5).

3. A heavy water reactor nuclear power plant pressure detection module according to claim 2, characterized in that: The pressing block (8) is connected to the elastic sheet (5) via screws (9).

4. A heavy water reactor nuclear power plant pressure detection module according to claim 2, characterized in that: The pressing block (8) and the elastic sheet (5) are mounted on the sensor base (2) via positioning pins (14).

5. A heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: A transition pad (10) is pasted on the plane of the sensor base (2) by a process, and the transition pad (10) is used for transferring the enameled wire (7).

6. A heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: The force transmission rod (4) is a bronze wire with a diameter of 0.2-0.3 mm.

7. A heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: The force transmission rod (4) is connected to the elastic sheet (5) and the movable block bracket (3) by welding.

8. A heavy water reactor nuclear power plant pressure detection module according to claim 1, characterized in that: The sensor base (2) is provided with a slotted hole for positioning and fixing with the mounting point on the pressure test body, and the sensor base (2) and the pressure test body are locked by fixing bolts (1).

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